Transformer



H. M. ACLY TRANSFORMER May 15, 1934.

Filed May 10, 1952 IhvehtOT': HGTTH M. Acly, MM

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Patented May 15, 1934 UNITED STATES PATENT OFFICE TRANSFORMER YorkApplication May 10, 1932, Serial No. 610,381

2 Claims.

My invention relates to transformers and more particularly to atransformer provided with a casing containing insulating liquid in whichthe transformer is immersed. In many cases, the

liquid in which a transformer is immersed does not completely fill thecasing, the space above the liquid being filled with air or other gas.If this space is not tightly sealed, some of the liquid may be spilledand lost from the casing,

particularly during shipment of the transformer, and the insulatingproperties of the liquid may be impaired by dust and moisture and by theoxygen of outside air entering the casing. The general object of theinvention is to provide an improved transformer casing in which thetransformer and liquid within the casing are effectively sealed.

The invention will be better understood from the following descriptiontaken in connection 0 with the accompanying drawing in which Fig. 1 is aview, partly in section, of a liquid immersed transformer with a sealedcasing constructed in accordance with the invention, and Fig. 2 is aplan view of the casing on a reduced scale.

Like reference characters indicate similar parts in both views of thedrawing.

The casing 10 shown in the drawing contains a body of insulating liquid11 in which a transformer 12 is immersed. The upper edge of the 31) wallof the casing has an outwardly projecting rim 13 which supports aremovable cover 14 of the casing. The liquid 11 and transformer 12 aresealed in the casing 10 by a flexible diaphragm 15, the outer edge ofthe diaphragm being clamped between the outer edge of the cover 14 andthe rim 13. The rim 13 has a flat upper surface and a gasket 16 betweenthis surface of the rim and the edge of the diaphragm assures a liquidand gas tight joint. A ring 17,

preferably of metaLis provided over the gasket 16 and between the edgeof the diaphragm 15 and the under surface of the cover 14, the edge ofthe diaphragm 15 preferably being secured to this ring 17 by somesuitable adhesive. The

cover 14 is clamped down by a clamping ring 18 which is formed insections drawn together by screw clamps 19.

The diaphragm 15 is not stretched tightly but normally sags down looselybelow the level of its clamped outer edge from which it is suspended, asshown in Fig. 1. Thus, the diaphragm may readily rise and fall as theliquid 11 expands and contracts in response to changes in temperature.The space between the diaphragm 15 and the cover 14 is connected withthe outside air through notches 20 in the upper surface of the ring 17so that the diaphragm may rise freely toward the cover.

The diaphragm 15 effectively prevents outside air, moisture and dustfrom reaching the liquid 11 and prevents leakage and loss of liquid ifthe transformer is handled roughly or even if it is accidently tippedover on its side as may happen during shipment. The inner surface of thecover 14 is shaped approximately to fit the diaphragm 15 substantiallythroughout its surface when the diaphragm is for any reason forced intoits extreme position towards the cover. Thus, for example, if thetransformer is tipped onto its side, the cover will support thediaphragm and prevent injury to it.

The invention has been explained by describing and illustrating apreferred embodiment thereof but it will be apparent that changes may bemade without departing from the spirit of the invention and the scope ofthe appended claims.

What I claim as new and desire to secure by Letters Patent in the UnitedStates is:

1. A casing containing a transformer immersed in an insulating liquid,said casing having a re- 30 movable cover, and a flexible sealingdiaphragm, the outer edge of said diaphragm being sealed to the casingwall near its upper rim, the diaphragm being loosely suspended from itsouter edge, and the inner surface of said cover being disposed andshaped substantially throughout its surface approximately to fit saiddiaphragm when the diaphragm is forced into its extreme position towardsthe cover.

2. A casing containing a transformer immersed in an insulating liquid,said casing having a removable cover, a flexible sealing diaphragmextending between the upper edge of the casing wall and the outer edgeof the cover, and a ring between the outer edges of said diaphragm andthe cover, the outer edge of said diaphragm being secured to said ringand being sealed to said casing rim, the surface of said ring next tothe cover being notched to provide communication between the outside airand the space between said diaphragm and cover.

HARRY M. ACLY.

